Safety clamp device



1935- J. VIGLIANO SAFETY CLAMP DEVICE Filed Nov. 21, 1953 Patented Feb. 26, 1935 SAFETY CLAMP DEVICE Joseph Vigliano, New York, N. Y. Application November. 21,1933, Serial No. 698,962

" 11 Claims. (01. 188-66) The present invention relates to clamping devices; and more particularly to safety clamps. The main object of the invention is to providea clamp of the type mentioned which consists of few simple parts which are: adapted to be: readily manufactured and assembled.

Another object of the invention,-is to provide a safety clamp which can be quickly applied to the ropes or cables of a hoisting equipment used for scaffolding by builders, contractors and others. Still another object of the invention is to apply a safety clamp to tighten the ropes in a manner that should the rope fail at any point, the scaffold platform will still be suspended thereby avoiding injury to the men working on it, which would otherwise happen when the rope fails and the men fall. With these and other objects in view which will more fully appear as the nature of the invention is better understood, the same consists in the combination, arrangement and construc tion of parts hereinafter described, pointed out in the appended claims and. illustrated in the accompanying drawing, it being understood that any changes may be made in the size and pro portion of the several parts and details of construction within the scope of the appended claims, without departing from the spirit of the invention or sacrificing any of the advantages of the invention. i

, I attain the above mentioned objects by a. mechanism illustrated in the accompanying drawing, in which: I

Fig. 1 is a plan view of thesafety clamp.

Fig 2 is a side view of Fig. 1.

Fig. 3 is a view of a well known hoisting equipment.

Fig. 4 is a side view of Fig. 3, with a safety clamp attached to the ropes.

In Fig. 1, a frame 1, is provided "with centrally located projections 2 on each side, and in opposite direction. These projections are shaped to receive a desired number of ropes each, as indicated by dot and dash circles. On both ends of frame 1, projections 4, are also provided and threaded to receive a threaded bolt 5 which carries casting 6 back and forth as bolt 5 is screwed in or out of projection 4. A screw 7 or its equivalent, is provided to pass thru casting 6 and fixed on the end of bolt 5, casting 6 is free to rotate about 7. A concaved surface 8 is provided on casting 6 to better fit the rope surface and prevent injury to the strands. Bolt 5 is provided with a rod 10 thru the head 11 for manipulation to apply sufiicient pressure to tighten and clamp together the ropes in projection 2.

In Fig. 3, the weight P or platform, is suspended on the hook of a pulley- (12), to keep'the weight P at any desired elevation, 'itis necessary to hold'the free end of the rope, to prevent same from being pulled-upward by the weight P which isaccomplished by -manual labor or other means. It is clearly seen, with this arrangement, that if the rope should fail at anypoint, the weight P must falL.

In-Fig. 4, the present invention is introduced and shows the application of the safety clamp device ofthe type specified. The clamp can be applied at any point between pulleyblock 12 and pulley block 13, (best applied a little above pulley block 12). q i

Theropes 14 and 15 on one sideof frame 1, and ropes 16' and 17 on the other, are set into projections 2 of the clamp and tightened by screwing bolt 5 inward, applying sufiicientpressure against the ropes to prevent slipping. Thus the weight P below the clamp will have two pointsof suspension on pulley ,block 13 and will also be suspended by four ropes which are held tight by the clamp. Although the ropeused is continuous, the tightening-by the ,clampwill change the direction of stresses inpart of the rope with the result of holding the Weight .P suspended in case the rope should fail at any point.

, If therope shouldfail at any point between the clamp and pulley block 13, the weight P? willistill 30 be suspended by the other pair, and, if a failure in the ropeshould occur between the clamp and the pulley block 12, the weightv P will remain suspendedby two or. more remaining ropes.

WhatIclaim:

1. A locking device for rope and pulley hoist having a plurality of pulley blocks the upper of which includes a plurality of pulleys operatively associated with the rope, said device including a plurality of clamps, each of said clamps having a fixed jaw structure, and a movable jaw cooperating therewith, and the fixed jaw structure of one clamp being a continuation of the fixed jaw structure of the other clamp, whereby successive runs of the rope, arranged in parts, are secured together in the different clamps.

2. In a multiblock rope and pulley hoist the upper block whereof is provided with a plurality of pulleys over which the rope operatively engages, a locking device for securing together in pairs successive runs of the rope, includinga plurality of similar clamps having individual movable jaws and fixed jaws cooperating therewith and providing an integral structure with each other.

3. In combination with amultiblock rope and. I pulley hoist the upper block whereof is provided with a plurality of pulleys over which the rope operatively passes, of a unitary rigid structure providing a plurality of fixed jaws each having the capacity of receiving a plurality of ropes, individual movable jaws for the fixed jaws, and screws. for mounting and actuating the movable jaws, said screws being threaded through the said structure. 5' i 1 4. A locking device for a rope'and pulley hoist having a plurality of pulley blocks the upper of which includes a plurality of pulleys operatively associated with the rope, said device including a plurality of clamps, each of said clamps having a fixed jaw structure, and a movable jaw cooper: ating therewith, and the fixed jaw structure of one clamp being a continuation of the fixed jaw structure of the other clamp, each fixed jaw structure being in the shape of a U with the transverse space between the arms of'the U being substantially equal to the diameter of the rope, whereby successive runsof the rope, arranged in pairs, are pressed together in the clamps, with one'run of each pair engaged by the movable jaw and the other by the fixed jaw-at the crotch'thereof.

5. In a multiblock rope and pulley hoist the upper block whereof is provided with a plurality of pulleys over which the rope operatively en'- gage's, a locking device for securing togethenin pairs successive runs of the rope, including a plurality of similar clamps having individual movable jaws and fixed jaws cooperating therewith and providing an integral structure with each other, the fixed jaw of each, clamp being in the nature of an elongated U of such width that a single strand of rope is adapted to be fitted therein. in engagement with the'arms of the U, and the movable jaw being guidedalong said arms.

6. In combination with a multiblock rope and pulley hoist the upper block whereof is provided with a plurality of pulleys over which the rope operatively passes, of a unitary'rigid'structure providing a plurality of fixed jaws each beingof elongated form and having the capacity of re ceiving a plurality of ropes to be pressed together, the diameter of each rope being equal to the distance between the arms of the U, individual movable jaws for the fixed jaws, and screws for mounting and actuating the movable jaws, said screws being threaded through the said structure.

7. In' a multiblock rope and pulley hoist'the upper block whereof is provided with a plurality of pulleys over which the rope operatively engages, a locking device for securing together in pairs successive runs of the rope, including a plurality of similar clamps having individual movable jaws and fixed jaws cooperating therewith and providing a rigid unitary structure with the clamps disposed in back to back relation to each other.

8. In combination with a rope and pulley hoist, of means for interconnecting the rope thereof,

includinga' fixed-fjaw and a movable jaw, the

jaws cooperating to provide an elongated opening having a width equal to a diameter of the rope, whereby the ropes are pressed together with the movable jaw contacting only one of the ropes.

9. In a multiblock rope and pulley hoist the upper block whereof is provided with a plurality of pulleys over which the rope operatively engages, a locking device for securing together in pairs successive runs of the rope, including a plurality of similar clamps having individual movable jaws'and' fixed jaws cooperating therewith and providing a rigid unitary structure with the clamps disposed in back to back relation to each other, and screws for actuating the movable jaws extending'in generally parallel relation to each other.

10. A clamp including an elongated bar, a pair of fixed jaws, a pair of movable jaws, actuating screws for the latter, and'hubs in which the screws are journaled, disposed on opposite sides of the said bar, said fixed jaws being connected to the bar at'points offset therealong and including oppositely extending retaining fiangesspaced from the bar and generally parallel thereto, so that said flanges occupy the same general region along the length'oi the bar, the movable jaws being movable into engagement with the corresponding fixed jaws and being guided along the flanges and the bar, the hubs being located at opposite ends of the bar and the fixed jaws being disposed therebetween, and the screws extending in opposite directions generally parallel tosaid bar.

11. A clamp including an elongated bar, a pair of fixed jaws a pairof movable jaws, actuating screws; for the movable jaws, and hubs in which the, screws are journaled, the fixed jaws being disposedion opposite sides of said bar and connected thereto, the movable jaws, screws and hubs being in general alinement -for cooperative action with the individual fixed jaws, said hubs being connected to opposite sides of said bar and the bar terminating'at the hubs. V

JOSEPH VIGLIANO. 

